Houston Marathon weekend

January 12, 2013 |Photos by James Nielsen and Melissa Phillip / Houston Chronicle

Thousands descend on Houston to take part in the Chevron Houston Marathon.

James Nielsen/Chronicle

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Patricia Donatti, left, and David Salinas, right, thrust their arms in the air as they near the finish line of the ABB 5K race during the Houston Marathon race weekend Saturday, Jan. 12, 2013, in Houston.

James Nielsen/Chronicle

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Patricia Donatti, left, and David Salinas, right, thrust their arms in the air as they near the finish line of the ABB 5K race during the Houston Marathon race weekend Saturday, Jan. 12, 2013, in Houston.